Lamar Odom not in rehab? Khloe Kardashian has lost communication

Despite reports that
Khloe Kardashian's husband,
Lamar Odom, has
checked himself into rehab, sources close to the beleaguered NBA star say it isn't so.

TMZ reports Odom has not contacted Khloe or the Kardashian family for days. Khloe reportedly gave Lamar an ultimatum that she will walk away from their marriage of he does not seek help for his drug addiction.

She has not addressed the issue publicly, but amidst the chaos of her husband's public downward spiral, Khloe sent out the following message via Twitter: "As much as I wish I were made of steel... I'm not ... I'm pretty d*** close to it though hehe."

Odom
was arrested for DUI on Aug. 30 after police say they spotted him driving "in a serpentine fashion." His California drivers license was suspended, and he was spotted later in a taxicab with Khloe. The couple are
reportedly separated, however, as Odom keeps disappearing on alleged drug binges.